I just bought a subwoofer for my car, it's a 10 inch kaption SPL. Every time I turn the music on, even on low volume the sub rattles and vibrates in a way it should not. If anyone knows anything about this problem please help. Its two days old and I'm pretty disappointed.

Is the sub box straped/bolted down? Check the rubber around the rim of the sub itself, if there is a tear that could be the cause of your problem.

No the box is not. And I checked the seal around the sub itself and it was fine but it still makes the noise and rattling.

Is the sub screwed into the box properly?